Best for: Areas with smooth pavement but intermittent street lighting, because although the beam is wide, it’s not the brightest. It installs without tools and easily swaps between bikes. Red side lights increase visibility.

Power source: Four AA batteries (included); swap in your own rechargeable batteries to make use of the included charger.

Bulb: High-power LED.

Modes: One.

Claimed burn time: 20 hours.

Best for: Commuting in areas with consistent street lighting. A tightly focused beam makes you visible but doesn’t illuminate the road well. The bracket mounts in seconds, and an indicator light alerts you to low batteries.

Best for: Roads without street lighting, where you need to be visible to cars, to see road signs, and avoid potholes. Mounts to your handlebar or helmet. It’s a premium product, so don’t leave it on your bike if you lock up outside.

Best for: Commuting on city streets without too much traffic, and only rare detours through areas with less lighting. The light has a bolder design than many such products and may not look good on every bike.

Best for: General commuting, especially when light conditions vary and you need to be able to see the road and be visible to cars. Mounts without tools. The waterproof, CNC-machined aluminum body looks slick but isn’t too gaudy.

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